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THE Sierra Madre or Bailey's Sparrow, Xenospiza baileyi, was described as a new genus and species from the high mountains of Durango and Jalisco less than 35 years ago (O. Bangs, Proc. •Vew England Zool. Cl., 12: 85-88, 1931). It has since been considered rare, and even 19 years ago, when F. A. Pitelka (Condor, 49: 199-203, 1947) described a new subspecies, only 11 specimens were known, of which he had at hand only 1 from La Cima, Distrito Federal, and 3 from western Mexico. Today the population from the sacaton bunch grass areas of La Cima, in the pass between the Valley of Mexico and Cuernavaca, is well represented by series in the collections of Phillips and the University of Minnesota Museum of Natural History. These series include specimens in all the plumage stages from stubby-tailed juveniles to worn adults and those having recently completed the prebasic molt. Other specimens are scattered through several museums in the United States. The population of Durango is now represented by additional specimens in the collection of the Robert T. Moore Laboratory of Zoology, Occidental College. With the accumulation of this material, and notes from several seasons' field work by the authors, it is a propitious time to gather together the information on this restricted endemic Mexican sparrow.

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